Detection of Wear in One-Cathode Plasma Torch Electrodes and its Impact on Velocity and Temperature of Injected Particles |
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Authors: | Georg Mauer José-Luis Marqués-López Robert Vaßen Detlev Stöver |
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Affiliation: | (1) Institut für Energieforschung IEF-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany |
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Abstract: | Wear at the electrode surfaces of a one-cathode plasma torch changes the characteristic fluctuation pattern of the plasma
jet. This affects the trajectory of the particles injected into the plasma jet in a non-controllable way, which degrades the
reproducibility of the process. Time-based voltage measurements and Fourier analysis were carried out on a one-cathode F4
torch at different wear conditions to determine the evolution of wear dependant characteristics. A significant correlation
is observed between increasing torch wear and decreasing voltage roughness and high frequency noise. Furthermore, by means
of particle diagnostic systems, the change in the particle velocity and temperature has been measured. The variations of the
particle characteristics are significant and thus an influence on the sprayed coating microstructure is to be expected.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. |
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Keywords: | electrode particle diagnostics plasma spraying process monitoring torch voltage wear |
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